Steam-dome



2 Sheets-She'et 1'.

(No Model.) I l S. M. VAUCLAIN.

STEAM DOME.

No. 590,867. .Patented Sept. 28,1897.

Fjal,

p z I D z Fj', 2 c;

(No Model.) 2 Sheets-Sheet 2.'

- S. M. VAUGLAIN.

%TEAM DOME.

PatentedSept. 28,189?.

by m

' FGL.

'N: NO NIS PEYEIS CO mmutno.. WMNNW D. C

ilnr'rnn TATES ATENT r men SAMUEL M. VAUCLAIN, OF PHILADELPHIA, PENNSYLVANIA STEAM-DOM E.

SPECIFICATION forming part of Letters Patent No. 590,867, datel September 28, 1897.

Application filed March 8, 1897. Serial No. 626,&87. (No model.)

TO call whom it may concern:

Be it known that I, SAMUEL M. VAUCLAIN, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Inprovements in Steam-Dones, of which the following is a specification. i

The ,object of my invention is to improve the Construction of the steam-domes-of locomotive-boilers by making the parts of pressed steel in such a manner 'that the cylindrical section can be riveted to the ring-sections by a straight line of rivets and in which the basefiange will more accurately fit the shell of the boiler, as fully described hereinafter( In the accompanying drawings, Figure l is a longitudinal sectional View through the stean-dome of a locomotive-boiler Constructedin acoordance with my invention. Fig. 2 is a transverse sectional View. Fig. 3 is a perspective View of the base-ring. Fig. 4 is a plan View of the blank: of the base-ring 'before being bent into shape.

A is the nain shell of the boiler, and B is the steam-dome. This done is made up of a base-ring D, which is Secured to the shell of the boiler, a crown-ring E, and a cylindrical section F, secured to the crown-ring and to the base-ring. The crown-ring E is rounded, as shown, and has a central opening.

Gr is a Gap-plate Secured to the ring E-in the present instance by bolts g g. Packing is placed between the ring and the cap, sc that the joint will be steam-tight. This cap supports the safety-valve of the nsual construction.

The cylindrical section F is made of sheet metal with the edges welded in lieu of the nsual method of rivetin g, thus making a complete cylinder free from riveted joints except where it is attached to the ring-sections, as shown.

The ring-section D is made from a blank (shown in Fig. 4) which has a circular pe- -iphery, and in the center is an oblong opening, so that when the blank is struck uppreferably in a hydraulic press-to the form shown in Fig. 3 the opening will be circular instead of oblong, and the upper edge d of the ring will be straight, so that the central section F can bemade from a sheet of even width throughout.

lleretofore when a ring-section has been made its upper edge has co nforned to the curve of the boiler, so that it neoessitated a neat cutting of the eclges ofthe plate from which the central section was made, and consequently the plate had to be rolled to a greater width than necessary and there Was 'considerable waste, owing to' the cutting of the peculiar curve, and, furthermore, each plate had to be laid ont and cut to this curve, so as to make a neat joint.

The npper portion of the base-ring D is bored out to receive the lower end of the central section F, so that a snug fit is assured between the ring and the central section when the two are riveted together, as shown in Figs; 1 and 2.

The periphery of the crown-ring E is adapted to be inserted within the outer end of the central section and riveted thereto, as shown. This crown-ring is also made from a fiat blank bent up by hydraulic pressure. It will 'be noticed that' the vertical flange d' of the ring is higher at the sides than at the ends, owing to the base-fiange taking the shape of the boiler. g

In making the base-ring D, I form the basefiange d in such a manner that it will approximately fit the average boiler, but I plane the under surface of the flange, so that it will fit snugly on the boiler, and draw the boilershell up tightly to this planed surface, so as to make a tight fit.

The opening a in the boiler-shell is some- What less in diameter than the stean-dome, so that there is sufficient room to properly set the steam-dome upon the boiler and to calk the joint. I clain as my invention- 1. The combination in a steam-dome for locomotive-boilers, of the pressed-steel basering having a base-fiange and. a Vertical flange, a pressed-steel crown-ring and a cylindrical central section having a welded joint and of an even height throughout, said central section being Secured to the Vertical flange of the base-ring and to the 'fiange of the crown-ring, substantially as described.

2. The combination of the base-ring having a flaring baseflange of the contour of the boiler-shell and having a planed under sur-` roo face and a vertical fla'ge, the upper edge of name to this speefiea-tion in the presence eI which is straight, said fiange being bored, a two subseribing witnesses.

central section resting within the bored po'- S IUFT M VAlvCT AIN tion of the base-rng, With a erown Secured J 5 to the central section, substantially as de- XVitnesses:

JACOB MCCONNELL,

In testinony whereof I have signed my GEO. II. SIMPKINS. 

